Travel to Mt.Aso in this November

I am going to Fukuoka in mid-November this year (2019) and I wound like to travel to Mt.Aso.
At this time, I am not sure that can I go there as my plan,
Is it open? or close for safety reasons?
If it is open, Is it difficult to go there by public transportation?
or rent a car is better?
Please suggest, Thanks

Renting a car is better, but you should have enough flexibility to cancel in case it snows. I traveled in January and my trip posts are below to give you a taste....

https://www.japan-guide.com/community/mfedley/report-3333
https://www.japan-guide.com/community/mfedley/report-3334

Is it open? or close for safety reasons?

The current state is explained below, but nobody knows what it will be in November:
https://www.japan-guide.com/e/e4552.html

If it is open, Is it difficult to go there by public transportation?

The area is generally not too convenient for exploration by public transportation. But all trains and buses are running normally, except the trains between Kumamoto and Aso.

or rent a car is better?

Yes.

I would certainly rent a car - it vastly increases your freedom in the area, and there are a lot of great sights to see that public transport really can't get you to. The Daikanbo Lookout when the weather is clear gives a spectacular commanding view of the world's biggest caldera.
https://youtu.be/gDNXUEJ0eqM

There is also Nabegataki Falls, which is one of the highlights of the region - be sure to walk behind the falls as well.
https://youtu.be/fqNCq1kMdac

And many others, like Kikuchi Gorge, the Yamabuki Springhead, and others. Even if the crater rim area is off limits, you can still see a lot of great places.